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There is a bug in Linux Mint 12 RC related to adding PPAs: when you add a PPA using "add-apt-repository", the .list file (under /etc/apt/sources.list.d/) uses "lisa" as the code name instead of "oneiric". Since the PPAs are not using the Ubuntu code name, they won't work and when running "sudo apt-get update", you'll get a "Failed to fetch [...] 404 Not Found" error.

A work-around is to edit the .list files under /etc/apt/sources.list.d/ and replace "lisa" with "oneiric", but to make it easier, I've updated Y PPA Manager with a work-around for this bug, so adding a PPA through Y PPA Manager should work as usual, without having to tweak anything else.

To install the latest Y PPA Manager in Linux Mint 12 RC, use the commands below: